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setDesignMode command in encounter

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oAwad

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Do I have to run "setDesignMode -process" in the beginning of the design or the tech. process is infered from imported LEF files ?

Also, how does this command influence the design flow ?
 

just type 'man setDesignMode' and read the description. you have to do it before any extraction, which means before any timing is calculated, which means before placement

technology is never inferred from LEF. the default is assumed to be 90nm.
 

yes, you should mention that command .

As per the process number , the tool will set the coupling capacitance threshold values accordingly in the background. design mode and analysis mode are to be set by us.
 

You should set "setDesignMode", so that the tool can apply certain technology related settings.
 

anilineda said:
yes, you should mention that command .

As per the process number , the tool will set the coupling capacitance threshold values accordingly in the background. design mode and analysis mode are to be set by us.
Click to expand...

This means it's fine if I set the design mode just before RC extraction or I'll have to re-design the layout if I didn't specify it from the beginning ?
 

oAwad said:
This means it's fine if I set the design mode just before RC extraction or I'll have to re-design the layout if I didn't specify it from the beginning ?
Click to expand...

see my answer above. it potentially affects everything that uses timing, including placement. you might have under/over designed, and then compensated later. your layout could be right and functional, but it might be a notch under optimal.
 

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